Azo dyes with A2-aminothiophene dye azo component and a coupling component and coupling component of the diphenylamine series

ABSTRACT

Thiopheneazo dye I which are chiefly useful as disperse dyes for dyeing textile material, in particular polyesters, have the formula &lt;IMAGE&gt; I  where the substituents are as defined in the description.

The present invention relates to a novel thiopheneazo dye of the general formula I ##STR2## in which the substituents have the following meanings: R¹ is cyano or C₁ -C₄ -alkoxycarbonyl,

R² is halogen, C₁ -C₆ -alkyl whose carbon chain may be interrupted by one or two oxygen atoms in ether function, C₁ -C.sub. -alkoxy or C₁ -C₆ -alkylthio which may each be phenyl-substituted, or phenylthio or phenylsulfonyl, which may each be substituted by halogen, C₁ -C₄ -alkyl or C₁ -C₄ -alkoxy,

R³ is cyano, C₁ -C₄ -alkanoyl, benzoyl, C₁ -C₄ -alkylsulfonyl or phenylsulfonyl,

R⁴ is hydrogen, cyano, C₁ -C₄ -alkoxy which may be hydroxyl- or C₁ -C₄ -alkoxy-substituted, C₁ -C₄ -alkoxycarbonyl, aminocarbonyl or mono- or di-C₁ -C₄ -alkylaminocarbonyl,

R⁵ is hydrogen, C.sub. -C₄ -alkyl or C₁ -C₄ -alkoxy, which may each be hydroxyl-, C₁ -C₄ -alkoxy- or C₁ -C₄ -alkanoyloxy-substituted, C₁ -C₄ -alkanoyloxy which may be hydroxyl-, chlorine-, cyano-, C₁ -C₄ -alkoxy- or phenoxy-substituted, C₁ -C₆ -alkanoylamino which may be hydroxyl-, chlorine-, cyano-, C₁ -C.sub. -alkoxy-, phenoxy- or C₁ -C₄ -alkanoyloxy-substituted, benzoylamino which may be chlorine-, cyano-, nitro-, C₁ -C₄ -alkyl-, C₁ -C₄ -alkoxy-, C₁ -C₄ -alkoxycarbonyl- or C₁ -C₄ -alkylsulfonyl-substituted, or C₁ -C₄ -alkoxycarbonyloxy, or di-C₁ -C₄ -alkylaminocarbonyloxy where the alkyl groups may be linked to one another to form a 6- or 7-membered ring containing the nitrogen atom of the amino group,

R⁶ is hydrogen, C₁ -C₁₀ -alkyl whose carbon chain may be interrupted by one to three oxygen atoms in ether function and which may be hydroxy-, halogen-, cyano-, C₁ -C₄ -alkanoyloxy- or C₁ -C₄ -alkoxycarbonyl-substituted, or C₃ -C₅ -alkenyl which may be substituted by hydroxyl, halogen, C₁ -C₄ -alkoxy or C₁ -C₄ -alkanoyloxy,

R⁷ is hydrogen, halogen, cyano, alkyl R⁶ of the type defined, C₁ -C₄ -alkoxy, amino or mono- or di-C₁ -C₄ -alkylamino, and

R⁸ has one of the meanings of R⁷,

and to the use thereof as disperse dyes for dyeing textile material.

Dyes which are to be used f or dyeing textile material must not only exhibit a high color strength but also have high light fastness and high fastness to dry heat setting and pleating. At the same time, in particular if deep shades are to be produced, high affinity for the fiber is indispensable.

DE-A-39 02 005 describes thiopheneazo dyes having coupling components based on monophenylamine. EP-A-201 896, EP-A-237 910, DE-A-35 29 831 and DE-A 35 35 133 disclose thiopheneazo dyes in general. However, dyes which contain diphenylamine as coupling component are not expressly mentioned.

It is an object of the present invention to provide novel thiopheneazo dyes which have advantageous application properties and with which it is possible to obtain particularly intense blue dyeings.

We have found that this object is achieved by the thiopheneazo dyes I defined at the beginning.

We have also found that the thiopheneazo dyes I &re advantageously usable for dyeing textile material.

Preferred embodiments of the invention are revealed in the subclaims.

A particularly preferred R¹ is cyano. It may also be C₁ -C₄ -alkoxycarbonyl such as propoxy, isopropoxy and butoxycarbonyl, but in particular methoxycarbonyl or ethoxycarbonyl.

Halogen R² is preferably bromine or in particular chlorine.

The following groups may also be used as R² :

C₁ -C₆ -alkyl groups whose carbon chain may be interrupted by one or two oxygen atoms in ether function, such as pentyl, isopentyl, sec-pentyl, tert-pentyl, hexyl and 2-methylpentyl, preferaby butyl; isobutyl, sec-butyl and tert-butyl and particularly preferably methyl, ethyl, propyl and isopropyl, but also methoxyethyl, ethoxyethyl, methoxypropyl and ethoxypropyl;

C₁ -C₆ -alkoxy groups with or without phenyl as substituent, such as pentyloxy, isopentyloxy, neopentyloxy, hexyloxy, benzyloxy and 2-phenylethoxy, preferably methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy and sec-butoxy;

C₁ -C₆ -alkylthio groups with or without phenyl as substituent, such as methylthio, ethylthio, propylthio, isopropylthio, butylthio, pentylthio, hexylthio, benzylthio and 2-phenylethylthio;

a phenylthio group or a phenylsulfonyl group which are each preferred in unsubstituted form but may also carry halogen, C₁ -C₄ -alkyl or C.sub. -C₄ -alkoxy as substituents, examples being -S-Ph-4-Cl and -SO₂ -Ph-4-CH₃, where Ph=phenyl.

R³ is preferably cyano, but may also be C₁ -C₄ -alkanoyl such as acetyl, propionyl, butyryl, isobutyryl or very particularly formyl. R³ may further be benzoyl or phenylsulfonyl or C₁ -C₄ -alkylsulfonyl such as methyl-, ethyl-, propyl-, isopropyl- and butylsulfonyl.

Particularly preferred radicals R⁴ are hydrogen and the C₁ -C₄ -alkoxy groups which were mentioned for R² and which may additionally carry hydroxyl or C₁ -C₄ -alkoxy as substituents, such as --O--(CH₂)₂ --OH, --O--(CH₂)₃ --OH, --[O--(CH₂)₂ ]₂ --OH, --O--CH₂ --CH(OH)--CH₂ (OH)--O--CH₃, --O--CH₂ --CH(OH)--CH₂ --O--C₄ H₉, --O--(CH₂)₂ --O--CH₃, --O--(CH₂)₂ --O--C₂ H₅, --O--(CH₂)₂ --O--C₃ H₇, --O--(CH₂)₂ --O--C₄ H₉, --O--(CH₂)₃ --O--CH₃, --O--(CH₂)₃ --O--C₂ H₅, --O--(CH₂)₃ --O--C₃ H₇ and --O--(CH₂)₃ --O--C₄ H₉.

Preferred radicals R⁴ are the C₁ -C₄ -alkoxycarbonyl groups mentioned for R¹. R⁴ may also be cyano and aminocarbonyl or mono- or di-C₁ -C₄ -alkylaminocarbonyl such as methylaminocarbonyl, ethylaminocarbonyl, propylaminocarbonyl, isopropyidminocarbonyl or butylaminocarbonyl or else dimethylaminocarbonyl, methylethylaminocarbonyl, diethylaminocarbonyl or diisopropylaminocarbonyl.

R⁵ may be not only hydrogen but also one of the following groups:

C₁ -C₄ -alkyl groups which may carry hydroxyl, C₁ -C₄ -alkoxy or C₁ -C₄ -alkanoyloxy as substituents, such as the C₁ -C₄ -alkyl groups mentioned for R² and --(CH₂)₂ --O--CO--CH₃ and --(CH₂)₃ --O--CO--C₂ H₅ ;

C₁ -C₄ -alkoxy groups which may carry hydroxyl, alkoxy or alkanoyloxy as substituents, such as the alkoxy groups mentioned for R² and R⁴ and --O--(CH₂)₂ --O--CO--CH₃, --O--CH₂ --CH(O--CO--CH₃)--CH₂ --O--CH₃ and --O--(CH₂)₃ --O--CO--CH₃, of which the C₁ -C₂ -alkoxy groups are particularly preferred;

particularly preferred C.sub. -C₄ -alkanoyloxy groups which are preferably unsubstituted, such as - formyloxy, propionyloxy and butyryloxy, in particular acetyloxy, but which may also be substituted by hydroxyl, chlorine, cyano, phenoxy or particularly C₁ -C₄ -alkoxy, e.g.: --O--CO--CH₂ --OH, --O--CO--CH₂ -Cl, --O--CO--CH₂ --CN, --O--CO--CH₂ --O--Ph and --O--CO--CH₂ --O--CH₃ ;

C₁ -C₆ -alkanoylamino groups which are preferably unsubstituted, such as pentanoylamino, preferably formylamino and butyrylamino, and also particularly preferably acetylamino and propionylamino, but which may also be substituted by hydroxyl, chlorine, cyano, in particular C₁ -C₄ -alkoxy, as well as phenoxy or C₁ -C₄ -alkanoyloxy, e.g.: --NH--CO--CH₂ --OH, --NH--CO--CH₂ -Cl, --NH--CO--CH₂ -CN, --NH--CO--CH₂ --O--CH₃, --NH--CO--CH₂ --O--C₂ H₅, --NH--CO--(CH)₂ --O--CH₃, --NH--CO--(CH₂)₄ --O--CH₃, --NH--CO--CH₂ --O--Ph and --NH--CO--CH₂ --O--CO-CH₃ ;

a benzoylamino group which is preferably unsubstituted but which may also be substituted by chlorine, cyano, nitro, C₁ -C₄ -alkyl, C₁ -C₄ -alkoxy, C₁ -C₄ -alkoxycarbonyl or C₁ -C₄ -alkylsulfonyl, such as --NH--CO--Ph, --NH--CO--Ph--4--Cl, --NH--CO--Ph--4--CN, --NH--CO--Ph--4--NO₂, --NH--CO--Ph--2--CH₃, --NH--CO--Ph--4--O--CH₃, --NH--CO--Ph--3--CO--O--CH₃ -- and --NH--CO--Ph--4--SO₂ --CH₃ ;

C₁ -C₄ -alkoxycarbonyloxy groups such as --O--CO--OCH₃, --O--CO--OC₂ H₅, --O--CO--OC₃ H₇, --O--CO--OCH(CH₃)₂, --O--CO--OC₄ H₉, --O--CO--OCH₂ --CH(CH₃)₂ and --O--CO--OC(CH₃)₂ ;

particularly preferably di-C₁ -C₄ -alkylaminocarbonyloxy groups whose alkyl moieties may also be linked to one another to form a 6- or 7-membered ring containing the nitrogen atom of the amino group, such as --O--CO--N(CH₃)₂, --O--CO--N(C₂ H₅)₂, --O--CO--N(C₃ H₇)₂, --O--CO--N[CH(CH₃)₂ ]₂, --O--CO--N(C₄ H₉)₂, --O--CO--N[CH₂ --CH(CH₃)₂ ]₂, --O--CO--N[C(CH₃)₃ ]₂, ##STR3##

A particularly preferred meaning of R⁶ is hydrogen. Other suitable possibilities are:

C₁ -C₁₀ -alkyls such as heptyl, octyl, 2-ethylhexyl, nonyl, decyl and branched radicals of this kind, preferably pentyl, isopentyl, sec-pentyl, tert-pentyl, hexyl and 2-methylpentyl, and particularly preferably methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl and tert-butyl, where the straight-chain alkyls are preferred and in each case the carbon chain may be interrupted by oxygen atoms in ether function and the groups halogen, cyano, C₁ -C₄ alkoxycarbonyl and preferably hydroxyl or C₁ -C₄ -alkanoyloxy may be present as substituents; examples being in particular --(CH₂)₂ O--CH₃ and --(CH₂)₂ O--C₂ H₅, but also --(CH₂)₂ --O--C₃ H₇, --(CH₂)₂ --O--C₄ H₉, --(CH₂)₃ --O--CH₃, --(CH₂)₃ --O--C₂ H₅, --CH₂ --CH(CH₃)--O--CH₃ --CH₂ --CH(CH₃)--O--C₂ H₅, --(CH₂)₄ --O--CH₃, --(CH.sub. 2)₄ --O--C₂ H₅, --CH₂ --CH(CH₂ H₅)--O--CH₃, --CH₂ CH(C₂ H₅)--O--C₂ H₅, --[(CH₂)₂ --O]₂ --CH₃, --[(CH₂)₂ --O]₂ --C₂ H₅, --[(CH₂)₂ --O]₃ --CH₃, --[(CH₂)₂ --O]₄ --CH₃, --[(CH₂)₃ --O]₂ --CH₃ and --[(CH₂)₃ --O]₂ --C₂ H₅, (CH₂)₂ --CN, --(CH₂)₃ --CN, --(CH₂)₂ -Cl, --CH₂ -CH(Br)--CH₃, (CH₂)₂ --CO--O--C₂ H₅, --(CH₂)₃ --OH, --(CH₂)₄ --OH and --CH₂ --CH(C₂ H₅)--OH but also in particular --(CH₂)₂ --OH, --(CH₂)₂ --O--CO--CH₃ and --(CH₂)₂ --O--CO--C₂ H₅ ;

C₃ -C₅ -alkenyl, preferably unsubstituted or else substituted by hydroxyl, halogen, C₁ -C₄ -alkoxy or C₁ -C₄ -alkanoyloxy, the preference here being for --CH(CH₃)--CH═CH₂, --CH₂ --CH═CH--CH₃, --CH₂ --CH═CH--CH₂ --CH₃, in particular --CH₂ --CH═CH₂ or also for example --CH₂ --CH═CH--CH₂ OH, --CH₂ --CH═CH--Cl, --CH₂ --CH═CH--CH₂ Cl, --CH₂ --CH═CH--CH₂ --O--CH₃ and --CH₂ --CH═CH--CH₂ --O--CO--CH₃.

R⁷ and in particular R⁸ are each preferably hydrogen. Preferred halogen is chlorine or bromine. It is also possible to use cyano and the C₁ -C₁₀ -alkyl groups mentioned above for R⁶, of which the unsubstituted or hydroxyl-substituted C₁ -C₄ -alkyl groups are particularly preferred. Particular preference is similarly given to the C₁ -C₄ -alkoxy groups mentioned for R⁵. Other possibilities are amino and mono- or di-C₁ -C₄ -alkylamino such as methylamino, ethylamino, propylamino, isopropylamino and butylamino and also dimethylamino, diethylamino, diisopropylamino and methylethylamino.

Thiopheneazo dyes I according to the present invention can be prepared in a conventional manner, for example by diazotizing an aminothiophene derivative of the general formula II ##STR4## and coupling the diazonium salt with a diphenylamine derivative of the general formula III ##STR5##

The starting compounds II and III are known or can be prepared by known methods (EP-A-193 885, DE-A-16 44 052, 17 19 060, 21 09 756 and 30 04 654).

A further method of preparing the thiopheneazo dyes I is, similarly to the method described for example in EP-A-237 910, to couple the diazotized aminothiophene derivative to a benzene derivative of the formula IV ##STR6## where X is a leaving group such as --Cl, --PH--SO₃ ⁻ or --O--R⁹ (R⁹ preferably being C₁ -C₆ -alkyl which may be hydroxyl- or alkoxy-substituted, C₁ -C₄ -alkanoyl, phenylsulfonyl or p-nitrophenylsulfonyl). The leaving group X is then displaced in a nucleophilic substitution reaction by the aniline derivative of the formula V ##STR7##

The thiopheneazo dyes I according to the present invention are advantageously suitable for use as dispersent dyes for dyeing textile material, in particular polyesters, but also cellulose esters, polyamides or blend fabrics of polyesters and cellulose fibers.

To obtain a favorable color buildup, it may in some cases be of advantage to use mixtures of dyes I.

The thiopheneazo dyes I are noteworthy for high affinity and, applied by the commonly known high-temperature dyeing methods, produce in particular on polyesters violet, blue or navy dyeings of high color strength with very good fastness properties, in particular good light fastness and fastness to dry heat setting and pleating.

EXAMPLES

Preparation and use of thiopheneazo dyes Ia ##STR8##

EXAMPLE 1 ##STR9##

9.4 g (0.05 mol) of 2 amino-3-cyano-4-chloro-5-formylthiophene were suspended in 60 ml of 85% strength by weight sulfuric acid at a temperature of not more than 30° C. 16.6 g of nitrosyl sulfuric acid (11.5% by weight of N₂ O₃) were added dropwise at 0°-5° C. in the course of 0.5 h. The mixture was then stirred at that temperature for a further 2 h.

The diazonium salt solution thus obtained was slowly added dropwise at 0°-5° C. to a solution of 13.5 g (0.05 mol) of N-phenyl-N-2-hydroxyethyl-3-acetaminoaniline in 25 ml of N,N-dimethylformamide, 100 ml of water, 20 ml of dilute hydrochloric acid, 0.5 g of sulfamic acid and 300 g of ice.

The precipitated dye was then filtered off, washed neutral and dried. The amount obtained thereof was 21.7 g, which corresponds to a yield of 83%.

Then the dye was used to dye a polyester staple fiber fabric by the high-temperature dyeing method.

To this end the dye was dissolved in dimethylformamide and the solution was added to an aqueous dyeing liquor which had been acidified with acetic acid.

In this dyebath the sample of polyester was dyed according to the following stepwise temperature profile: first a few min at 50°-60° C., then heating up to 120°-140° C. in the course of 30 min, then a further 90 min at that temperature.

The subsequently conventionally washed and reduction cleared polyester sample exhibited a fast navy dyeing.

The dyes Ia shown below in Table 1 were prepared in similar yields by the method of Example 1 and likewise tested in respect of their dyeing properties, again by the method of Example 1.

    TABLE 1       ##STR10##       Ia           Hue on Ex. R.sup.1 R.sup.2 R.sup.3 R.sup.4 R.sup.5 R.sup.6      R.sup.7 R.sup.8 polyester         2 CN SC.sub.2 H.sub.5 CHO H NHCOC.sub.2 H.sub.5 H H CH.sub.3 blue  3      CN Cl CHO H NHCOCH.sub.3 C.sub.2 H.sub.5 H H navy  4 CN Cl CHO H      OCOCH.sub.3 H 2-CH.sub.3 H bluish violet  5  CN Cl CHO H OCOC.sub.2      H.sub.5 H 2-CH.sub.3 H bluish violet       6 CN Cl CHO H OCH.sub.3 H 2-CH.sub.3 H navy  7 CN Cl CHO H NHCOCH.sub.3 H       H H navy  8 CN Cl CHO H NHCOCH.sub.3 CH.sub.2CH(OH)C.sub.2 H.sub.5 H H      blue  9 CN Br CHO H NHCOCH.sub.3 H H H bluish violet 10 CN Cl CHO      COOC.sub.2 H.sub.5 NHCOCH.sub.3 H H H blue 11 CN Cl CHO H NHCOCH.sub.3      (CH.sub.2).sub.2OCOCH.sub.3 H H navy 12 CN Cl CN H NHCOCH.sub.3 (CH.sub.2      ).sub.2OH H H navy 13 CN Cl CHO H NHCOC.sub.2 H.sub.5 (CH.sub.2).sub.2OH H       H navy 14 CN Cl CHO H NHCOC.sub.3 H.sub.7 (CH.sub.2).sub.2OH H H blue      15 CN Cl CHO H NHCOCH.sub.3 C.sub.4 H.sub.9 H Cl blue 16 CN Cl CHO H      OCH.sub.3 H 2-CH.sub.3 H violet 17 CN Cl CN H NHCOCH.sub.3 H H H blue 18 C      OOC.sub.2 H.sub.5 Cl CHO H NHCOCH.sub.3 (CH.sub.2).sub.2OH H H violet 19 C      N OC.sub.2 H.sub.5 CHO H NHCOCH.sub.3 (CH.sub.2).sub.2OH H H blue 20 CN      S-Ph CHO H NHCOC.sub.2 H.sub.5 C.sub.2 H.sub.5 H CH.sub.3 blue 21  CN      SO.sub.2 -Ph CHO H NHCOC.sub.2 H.sub.5 (CH.sub.2).sub.2OC.sub.2 H.sub.5      H C.sub.2 H.sub.5 blue 22 CN SCH.sub.3 CHO H OCH.sub.3 H 2-CH.sub.3 H      violet 23 CN SO.sub.2 -Ph CHO H NHCOCH.sub.3 H H CH.sub.3 greenish blue      24 CN SO.sub.2 -Ph CHO H NHCOCH.sub.3 H H CH(CH.sub.3) blue 25 CN      SCH.sub.3 CHO H NHCOC.sub.2       H.sub.5 H H H blue 26 CN Cl CHO H NHCOC.sub.2       H.sub.5 (CH.sub.2).sub.2OCOCH.sub.3 H H blue 27 CN Cl CHO H NHCOC.sub.2      H.sub.5 H H H blue 28 CN Cl CHO H NHCOC.sub.4 H.sub.9 CH.sub.3 H H blue      29 CN Cl CHO H NHCOCH.sub.3 (CH.sub.2).sub.2OH 3-CH.sub.3 CH.sub.3 blue      30 CN Cl CHO H NHCOCH.sub.3 (CH.sub.2).sub.2OC.sub.2 H.sub.5 H CH.sub.3      blue 31 CN Cl CHO H NHCOCH.sub.3 CH.sub.2CHCH.sub.2 H H blue 32 CN Cl      CHO H NHCOCH.sub.3 (CH.sub.2).sub.2OH 3-OCH.sub.3 OCH.sub.3 blue 33 CN      Cl CN H NHCOC.sub.2 H.sub.5 (CH.sub.2).sub.2OH H H blue 34 CN Cl CN H      NHCOCH.sub.3 C.sub.3 H.sub.7 H CH.sub.3 blue 35 CN Cl CHO CN NHCOC.sub.2      H.sub.5 H H OC.sub.2 H.sub.5 blue 36 CN Cl CHO CONH.sub.2 NHCOCH.sub.3 H H       H blue 37 CN Cl CHO CONH.sub.2 NHCOCH.sub.3 H H H blue 38 CN Cl CHO H   C      NHOCH.sub.3 (CH.sub.2).sub.3OH H H navy 39 CN Cl CHO H NHCOC.sub.2      H.sub.5 (CH.sub.2).sub.2OCOC.sub.2 H.sub.5 H H navy 40 COOC.sub.2      H.sub.5 Cl CHO H NHCOCH.sub.3 H H H bluish violet 41 COOC.sub.2 H.sub.5      Cl CHO H OCH.sub.3 C.sub.2 H.sub.5 2-CH.sub.3 H violet 42 COOC.sub.2      H.sub.5 Cl CHO H NHCOCH.sub.3 (CH.sub.2).sub.2OH 3-OCH.sub.3 OCH.sub.3      navy 43 CN Cl CHO H NHCOCH.sub.3  (CH.sub.2).sub.2OH H OC.sub.2 H.sub.5      navy 44 CN SO.sub.2 -Ph CHO H NHCOCH.sub.3 (CH.sub.2).sub.2OH H H navy      45 CN SO.sub.2 -Ph CHO H NHCOCH.sub.3 H H H blue 46 CN SCH.sub.3 CHO H   C      NHOCH.sub.3 H H H blue 47 CN Cl CN H NHCOCH.sub.3 H H OCH.sub.3 blue 48      CN Cl CN H NHCOCH.sub.3 (CH.sub.2).sub.2OH H OCH.sub.3 blue 49 CN Cl CN      H NHCOCH.sub.3 H H H blue 50 CN OC.sub.2 H.sub.5 CHO H NHCOCH.sub.3 H H      H blue 51 CN SO.sub.2CH.sub.3 CHO H NHCOCH.sub.3 (CH.sub.2).sub.2OH H H      blue 52 CN SO.sub.2CH.sub.3 CHO H NHCOC.sub.2 H.sub.5 H H H blue 53 CN      Cl CHO H OC.sub.2 H.sub.5 (CH.sub.2).sub.2OH H OC.sub.2 H.sub.5 bluish      violet 54 CN Cl CN H OC.sub.4 H.sub.9 (CH.sub.2).sub.2OH H CH.sub.3      reddish blue 55 CN OC.sub.2       H.sub.5 CHO H O(CH.sub.2).sub.2OH H 3-CH.sub.3 OCH.sub.3 reddish blue      56 CN Cl CN H O(CH.sub.2).sub.2OH H 2-CH.sub.3 C.sub.2 H.sub.5 reddish      blue 57 CN Cl CN H O(CH.sub.2).sub.2OCOCH.sub.3 (CH.sub.2).sub.2OCOCH.sub      .3 H CH.sub.3 reddish navy 58 CN CH.sub.3 CN H O COOCH.sub.3 (CH.sub.2).s      ub.2OCOCH.sub.3 H H reddish navy 59 CN Cl CHO H OCON(CH.sub.3).sub.2 H      2-CH.sub.3 H reddish blue 60 CN Cl CHO H OCON(C.sub.2 H.sub.5).sub.2 H      2-CH.sub.3 CH.sub.3 reddish blue 61 COOCH.sub.3 Cl CN H NHCOCH.sub.3      (CH.sub.2).sub.2OH H H blue 62 COOCH.sub.3 Cl CHO H NHCOCH.sub.3 H H      OC.sub.2       H.sub.5 blue 63 COOCH.sub.3 Cl CHO H NHCOCH.sub.3 (CH.sub.2).sub.2OH H      H blue 64 CN CH(CH.sub.3).sub.2 CN H NHCOC.sub.2                         O       H.sub.5 (CH.sub.2).sub.2H H H blue 65 CN CH.sub.3 CHO H NHCOCH.sub.3       (CH.sub.2).sub.2OH H OC.sub.2 H.sub.5 blue 66 CN CH.sub.3 CHO H      OCON(C.sub.3 H.sub.7).sub.2 (CH.sub.2).sub.2OH H Cl blue 67 CN C.sub.2      H.sub.5 CN H NHCOCH.sub.3 (CH.sub.2).sub.2OH H H blue  68 CN CH.sub.3 CN H       ##STR11##       (CH.sub.2).sub.2OH H H blue  69 CN (CH.sub.2).sub.2OCH.sub.3 CN H      NHCOC.sub.2       H.sub.5 (CH.sub.2).sub.2OH H H blue

EXAMPLE 70 ##STR12##

A solution of 3.8 g (0.01 mol) of 2-(2'-propionylamino-4',5'-dimethoxyphenylazo)-3-cyano-4-methyl-5-cyanothiophene and 2.1 9 (0.015 mol) of p-(2-hydroxyethyl)aniline in 100 ml of N-methylpyrrolidone was heated to 120° C. and stirred at that temperature for 6 hours.

After cooling down, the reaction mixture was poured onto 500 mi of water. The precipitated dye was filtered off, washed neutral and dried.

This gave 4.0 g of dye, which corresponds to a yield of 82%; melting point: 103° C.; λ_(max) =604 nm (acetone).

Using the high-temperature process described in Example 1 a fast dark blue dyeing was obtained with the dye on polyester staple fiber fabric.

The dyes Ib listed in Table 2 were prepared by the method of Example 70 in similar yields and likewise investigated in respect of their dyeing characteristics.

                                      TABLE 2                                      __________________________________________________________________________      ##STR13##                                             Ib                      Ex.                                                                               R.sup.2                                                                            R.sup.3                                                                             R.sup.4   R.sup.5   R.sup.7                                                                              R.sup.8   Hue on polyester               __________________________________________________________________________     71 CH.sub.3                                                                           CN   OCH.sub.3 NHCOCH.sub.3                                                                             H     OC.sub.2 H.sub.5                                                                         blue                           72 CH.sub.3                                                                           CN   OC.sub.2 H.sub.5                                                                         NHCOCH.sub.3                                                                             H     OC.sub.2 H.sub.5                                                                         blue                           73 CH.sub.3                                                                           CN   OCH.sub.3 NHCOCH.sub.3                                                                             H     O(CH.sub.2).sub.2OH                                                                      blue                           74 Cl  CN   O(CH.sub.2).sub.2OH                                                                      NHCOCH.sub.3                                                                             H     OC.sub.2 H.sub. 5                                                                        blue                           75 Cl  CN   OCH.sub.3 NHCOCH.sub.3                                                                             H     (CH.sub.2).sub.2OH                                                                       blue                           76 Cl  CHO  OCH.sub.3 NHCOC.sub.2 H.sub.5                                                                      H     (CH.sub.2).sub.2OH                                                                       blue                           77 Cl  CHO  OC.sub.2 H.sub.5                                                                         NHCOCH.sub.3                                                                             H     (CH.sub.2).sub.2OH                                                                       blue                           78 Cl  CHO  OCH.sub.3 NHCOCH.sub.3                                                                             H     OC.sub.2 H.sub.5                                                                         greenish blue                  79 Cl  CHO  COOCH.sub.3                                                                              NHCOCH.sub.3                                                                             3-OCH.sub.3                                                                          OCH.sub.3 blue                           __________________________________________________________________________ 

We claim:
 1. A thiopheneazo dye of the general formula I ##STR14## in which the substituents have the following meanings: R¹ is cyano;R² is chlorine, bromine or C₁ -C₄ -alkyl, R³ is cyano or formyl, R⁴ is hydrogen, R⁵ is C₁ -C₂ - alkoxy which may be hydroxyl-, C₁ -C₂ -alkoxy- or C₁ -C₂ -alkanoyloxy-substituted, or is C₁ -C₄ -alkanoyloxy or C₁ -C₄ -alkanoylamino which may each be substituted by hydroxyl, cyano or C₁ -C₄ -alkoxy, or is di-C₁ -C₄ -alkylaminocarbonyloxy, R⁴ is hydrogen, C₁ -C₈ -alkyl whose carbon chain may be interrupted by one or two oxygen atoms in ether function and which may be hydroxyl- or C₁ -C₄ -alkanoyloxy-substituted, or C₃ -C₅ -alk-2-en-1-yl which may be substituted by hydroxyl or chlorine, R⁷ is hydrogen, halogen, C₁ -C₄ -alkyl which may be hydroxyl-substituted or C₁ -C₄ -alkoxy, and R⁸ has one of the aforementioned meanings of R⁷.
 2. A thiopheneazo dye of the general formula I of claim 1, in which the substituents have the following meanings:R¹ is cyano; R² is chlorine or C₁ -C₃ -alkyl, R³ is cyano or formyl, R⁴ is hydrogen; R⁵ is C₁ -C₂ -alkoxy which may be hydroxyl-, C₁ -C₂ -alkoxy- or C₁ -C₂ -alkanoyloxy-substituted, or is C₁ -C.sub. -alkanoyloxy or C.sub. -C₄ -alkanoylamino which may each be substituted by C.sub. -C₄ -alkoxy, or is di-C₁ -C₄ -alkylaminocarbonyloxy, R⁶ is hydrogen or C₁ -C₄ -alkyl whose carbon chain may be interrupted by one oxygen atom in ether function and which may be substituted by hydroxyl, R⁷ is hydrogen, chlorine, bromine, C₁ -C₄ -alkyl which may be hydroxyl-substituted or C₁ -C₄ -alkoxy, and R⁸ is hydrogen.
 3. A method for dyeing textile material, which comprises applying thereto a thiopheneazo dye of the general formula I as claimed in claim 1 as disperse dye.
 4. A method of dyeing polyester, which comprises applying thereto a thiopheneazo dye of the general formula I as claimed in claim
 1. 